ISEE Database for Nonlinear Force-Free Field of Solar Active Regions

Typical image of NLFFF extrapolation

Data description

The database contains the three-dimensional (3D) magnetic fields of solar active regions analyzed by Kusano et al. (2020). The 3D magnetic field are extrapolated by the magnetohydrodynamic relaxation method (Inoue et al., 2014) from the vector magnetic field data observed by the Solar Dynamics Observatory (SDO/HMI). In this database, Space weather HMI Active Region Patch data remapped to a Lambert Cylindrical Equal-Area projection (SHARP CEA) are used. For the detailed list and parameters of the sampled data, please refer to Kusano et al. (2020).

Terms of Use

When you publish your work using this database, we strongly encourage to acknowledge the publisher as follows as well as to cite the related papers.

Example of acknowledgments

ISEE Database for Nonlinear Force-Free Field of Solar Active Regions (doi: 10.34515/DATA_HSC-00000) was developed by the Hinode Science Center, Institute for Space-Earth Environmental Research (ISEE), Nagoya University.

Data DOI

  • K. Kusano, H. Iijima, T. Kaneko, S. Masuda, T. IJu, and S. Inoue, "ISEE Database for Nonlinear Force-Free Field of Solar Active Regions," Hinode Science Center, Institute for Space-Earth Environmental Research, Nagoya University, 2021.
    doi: 10.34515/DATA.HSC-00000

Related articles

  1. K. Kusano, T. Iju, Y. Bamba, and S. Inoue, "A Physics-Based Method That Can Predict Imminent Large Solar Flares," Science, vol. 369, no. 6503, pp. 587-591, 2020.
    doi: 10.1126/science.aaz2511
  2. S. Inoue, T. Magara, V. S. Pandey, D. Shiota, K. Kusano, G. S. Choe, and K. S. Kim, "Nonlinear Force-Free Extrapolation of the Coronal Magnetic Field Based on the MHD-Relaxation Method," The Astrophysical Journal, vol. 780, no. 1, p. 101, 2013.
    doi: 10.1088/0004-637X/780/1/101

Data format

Download a PDF file

The NLFFF data is stored as netCDF files.
Each file contains three-dimensional vector magnetic field (NLFFF and potential) in Cartesian coordinates.

We here provide some examples to read a data file.

Interactive Data Language (IDL)

A sample IDL script returns an IDL structure as output.
Usage:


    IDL> data = load_nlfff('sample_filename.nc') ;; read data silently
    IDL> data = load_nlfff('sample_filename.nc',verbose=1) ;; print meta data
    IDL> data = load_nlfff('sample_filename.nc',verbose=2) ;; print meta data and plot figures
    IDL> help,data ;; show tags stored in the structure
    

Python

A sample Python script defines a Python class to read the dataset.
Please note that the netcdf4-python is required.
Usage:


    >>> import load_nlfff
    >>> data = load_nlfff.nlfff('sample_filename.nc') # read data
    >>> data.info() # print meta-data
    >>> data.plot() # plot Bx, By, Bz
    >>> print(vars(data).keys()) # list class variables
    

Fortran

The fortran program and Makefile are available to read the dataset.
Please note that the netCDF library should be linked.
Please edit the Makefile for your compiler and libraries.
Usage:


   $ make
   $ ./read_nlfff
   Enter netCDF file name:
   "sample_filename.nc"
    

ParaView

Download a PDF file

List of available NLFFF data

NOAA AR Download Starting date/time Ending date/time Start date End date File count
11078 11078 data list 20100609_000000 20100609_000000 20100609 20100609 1
11089 11089 data list 20100725_000000 20100725_000000 20100725 20100725 1
11092 11092 data list 20100804_000000 20100804_000000 20100804 20100804 1
11093 11093 data list 20100810_000000 20100810_000000 20100810 20100810 1
11108 11108 data list 20100923_000000 20100923_000000 20100923 20100923 1
11109 11109 data list 20100928_000000 20100928_000000 20100928 20100928 1
11117 11117 data list 20101026_000000 20101026_000000 20101026 20101026 1
11130 11130 data list 20101129_000000 20101129_000000 20101129 20101129 1
11131 11131 data list 20101208_000000 20101208_000000 20101208 20101208 1
11133 11133 data list 20101210_000000 20101210_000000 20101210 20101210 1
11140 11140 data list 20110106_000000 20110106_000000 20110106 20110106 1
11158 11158 data list 20110213_120000 20110215_120000 20110213 20110215 65
11163 11163 data list 20110302_000000 20110302_000000 20110302 20110302 1
11164 11164 data list 20110304_000000 20110304_000000 20110304 20110304 1
11165 11165 data list 20110302_000000 20110302_000000 20110302 20110302 1
11166 11166 data list 20110309_000000 20110310_030000 20110309 20110310 14
11169 11169 data list 20110311_000000 20110311_000000 20110311 20110311 1
11176 11176 data list 20110328_000000 20110328_000000 20110328 20110328 1
11183 11183 data list 20110402_000000 20110402_000000 20110402 20110402 1
11190 11190 data list 20110414_040000 20110414_040000 20110414 20110414 1
11195 11195 data list 20110425_000000 20110425_000000 20110425 20110425 1
11196 11196 data list 20110425_000000 20110425_230000 20110425 20110425 24
11199 11199 data list 20110427_000000 20110427_000000 20110427 20110427 1
11236 11236 data list 20110620_000000 20110620_000000 20110620 20110620 1
11257 11257 data list 20110718_000000 20110718_000000 20110718 20110718 1
11260 11260 data list 20110730_000000 20110730_000000 20110730 20110730 1
11261 11261 data list 20110801_000000 20110804_060000 20110801 20110804 26
11263 11263 data list 20110804_000000 20110804_230000 20110804 20110804 24
11271 11271 data list 20110822_000000 20110822_000000 20110822 20110822 1
11283 11283 data list 20110905_180000 20110909_000000 20110905 20110909 91
11289 11289 data list 20110913_000000 20110913_000000 20110913 20110913 1
11301 11301 data list 20110925_000000 20110925_000000 20110925 20110925 1
11302 11302 data list 20110923_120000 20110929_230000 20110923 20110929 110
11305 11305 data list 20111001_000000 20111001_000000 20111001 20111001 1
11312 11312 data list 20111011_000000 20111011_000000 20111011 20111011 1
11316 11316 data list 20111016_000000 20111016_000000 20111016 20111016 1
11325 11325 data list 20111026_000000 20111026_000000 20111026 20111026 1
11327 11327 data list 20111022_000000 20111022_000000 20111022 20111022 1
11330 11330 data list 20111028_000000 20111028_000000 20111028 20111028 1
11339 11339 data list 20111104_010000 20111108_000000 20111104 20111108 3
11354 11354 data list 20111123_000000 20111123_000000 20111123 20111123 1
11358 11358 data list 20111129_000000 20111129_000000 20111129 20111129 1
11362 11362 data list 20111204_000000 20111204_000000 20111204 20111204 1
11363 11363 data list 20111205_000000 20111205_000000 20111205 20111205 1
11374 11374 data list 20111214_000000 20111214_000000 20111214 20111214 1
11384 11384 data list 20111226_000000 20111226_000000 20111226 20111226 1
11386 11386 data list 20111230_000000 20111230_000000 20111230 20111230 1
11387 11387 data list 20111226_000000 20111226_000000 20111226 20111226 1
11389 11389 data list 20120104_000000 20120104_000000 20120104 20120104 1
11390 11390 data list 20120101_000000 20120101_000000 20120101 20120101 1
11391 11391 data list 20120109_000000 20120109_000000 20120109 20120109 1
11393 11393 data list 20120106_000000 20120106_000000 20120106 20120106 1
11402 11402 data list 20120121_000000 20120123_110000 20120121 20120123 13
11416 11416 data list 20120212_000000 20120212_000000 20120212 20120212 1
11422 11422 data list 20120220_000000 20120220_000000 20120220 20120220 1
11428 11428 data list 20120308_000000 20120308_000000 20120308 20120308 1
11429 11429 data list 20120304_120000 20120311_220000 20120304 20120311 177
11455 11455 data list 20120413_000000 20120413_000000 20120413 20120413 1
11459 11459 data list 20120421_000000 20120421_000000 20120421 20120421 1
11460 11460 data list 20120420_000000 20120420_000000 20120420 20120420 1
11465 11465 data list 20120424_000000 20120424_000000 20120424 20120424 1
11471 11471 data list 20120504_000000 20120504_000000 20120504 20120504 1
11476 11476 data list 20120509_010000 20120512_230000 20120509 20120512 59
11484 11484 data list 20120520_000000 20120520_000000 20120520 20120520 1
11486 11486 data list 20120524_000000 20120524_000000 20120524 20120524 1
11492 11492 data list 20120531_000000 20120531_000000 20120531 20120531 1
11497 11497 data list 20120605_000000 20120605_000000 20120605 20120605 1
11512 11512 data list 20120629_000000 20120629_000000 20120629 20120629 1
11515 11515 data list 20120702_000000 20120707_040000 20120702 20120707 123
11520 11520 data list 20120712_000000 20120712_230000 20120712 20120712 24
11543 11543 data list 20120814_000000 20120814_000000 20120814 20120814 1
11555 11555 data list 20120831_000000 20120831_000000 20120831 20120831 1
11560 11560 data list 20120902_000000 20120902_000000 20120902 20120902 1
11562 11562 data list 20120904_000000 20120904_000000 20120904 20120904 1
11564 11564 data list 20120906_000000 20120906_000000 20120906 20120906 1
11579 11579 data list 20120930_000000 20120930_000000 20120930 20120930 1
11582 11582 data list 20121002_000000 20121002_000000 20121002 20121002 1
11585 11585 data list 20121008_000000 20121008_000000 20121008 20121008 1
11589 11589 data list 20121016_163600 20121016_163600 20121016 20121016 1
11591 11591 data list 20121018_000000 20121018_000000 20121018 20121018 1
11596 11596 data list 20121024_000000 20121024_000000 20121024 20121024 1
11598 11598 data list 20121023_000000 20121027_000000 20121023 20121027 13
11613 11613 data list 20121112_200000 20121113_110000 20121112 20121113 14
11618 11618 data list 20121122_000000 20121122_000000 20121122 20121122 1
11620 11620 data list 20121125_000000 20121125_000000 20121125 20121125 1
11635 11635 data list 20121225_000000 20121225_000000 20121225 20121225 1
11640 11640 data list 20130101_000000 20130101_000000 20130101 20130101 1
11652 11652 data list 20130112_000000 20130112_000000 20130112 20130112 1
11654 11654 data list 20130114_000000 20130114_000000 20130114 20130114 1
11660 11660 data list 20130121_000000 20130121_000000 20130121 20130121 1
11665 11665 data list 20130204_000000 20130204_000000 20130204 20130204 1
11682 11682 data list 20130227_000000 20130227_000000 20130227 20130227 1
11698 11698 data list 20130315_000000 20130315_000000 20130315 20130315 1
11711 11711 data list 20130406_000000 20130406_000000 20130406 20130406 1
11718 11718 data list 20130410_000000 20130410_000000 20130410 20130410 1
11719 11719 data list 20130410_050000 20130412_000000 20130410 20130412 7
11723 11723 data list 20130418_000000 20130418_000000 20130418 20130418 1
11726 11726 data list 20130421_000000 20130421_230000 20130421 20130421 24
11730 11730 data list 20130428_000000 20130428_000000 20130428 20130428 1
11731 11731 data list 20130501_000000 20130501_000000 20130501 20130501 1
11736 11736 data list 20130502_000000 20130502_000000 20130502 20130502 1
11745 11745 data list 20130517_000000 20130517_000000 20130517 20130517 1
11748 11748 data list 20130520_000000 20130520_000000 20130520 20130520 1
11755 11755 data list 20130527_000000 20130527_000000 20130527 20130527 1
11765 11765 data list 20130607_000000 20130607_000000 20130607 20130607 1
11776 11776 data list 20130619_000000 20130619_000000 20130619 20130619 1
11777 11777 data list 20130626_000000 20130626_000000 20130626 20130626 1
11793 11793 data list 20130721_000000 20130721_000000 20130721 20130721 1
11818 11818 data list 20130815_000000 20130815_000000 20130815 20130815 1
11827 11827 data list 20130824_000000 20130824_000000 20130824 20130824 1
11835 11835 data list 20130831_000000 20130831_000000 20130831 20130831 1
11846 11846 data list 20130924_000000 20130924_000000 20130924 20130924 1
11861 11861 data list 20131013_000000 20131013_000000 20131013 20131013 1
11875 11875 data list 20131023_000000 20131023_000000 20131023 20131023 1
11877 11877 data list 20131023_120000 20131025_000000 20131023 20131025 19
11882 11882 data list 20131031_000000 20131031_000000 20131031 20131031 1
11884 11884 data list 20131031_000000 20131103_120000 20131031 20131103 85
11890 11890 data list 20131104_213600 20131110_103600 20131104 20131110 86
11899 11899 data list 20131119_000000 20131119_000000 20131119 20131119 1
11908 11908 data list 20131201_000000 20131201_000000 20131201 20131201 1
11909 11909 data list 20131203_000000 20131203_000000 20131203 20131203 1
11916 11916 data list 20131206_000000 20131206_000000 20131206 20131206 1
11917 11917 data list 20131213_000000 20131213_000000 20131213 20131213 1
11931 11931 data list 20131225_000000 20131225_000000 20131225 20131225 1
11936 11936 data list 20131229_000000 20140102_120000 20131229 20140102 50
11944 11944 data list 20140107_003600 20140108_010000 20140107 20140108 24
11946 11946 data list 20140107_000000 20140107_000000 20140107 20140107 1
11967 11967 data list 20140203_000000 20140204_230000 20140203 20140204 48
11968 11968 data list 20140203_000000 20140203_000000 20140203 20140203 1
11974 11974 data list 20140212_000000 20140212_000000 20140212 20140212 1
11977 11977 data list 20140217_000000 20140217_000000 20140217 20140217 1
11991 11991 data list 20140304_000000 20140304_000000 20140304 20140304 1
11996 11996 data list 20140307_000000 20140307_000000 20140307 20140307 1
12002 12002 data list 20140314_000000 20140314_000000 20140314 20140314 1
12011 12011 data list 20140319_000000 20140319_000000 20140319 20140319 1
12014 12014 data list 20140326_000000 20140326_000000 20140326 20140326 1
12017 12017 data list 20140329_100000 20140329_230000 20140329 20140329 14
12021 12021 data list 20140402_000000 20140402_000000 20140402 20140402 1
12026 12026 data list 20140406_000000 20140406_000000 20140406 20140406 1
12034 12034 data list 20140416_000000 20140416_000000 20140416 20140416 1
12042 12042 data list 20140422_000000 20140422_000000 20140422 20140422 1
12047 12047 data list 20140501_000000 20140501_000000 20140501 20140501 1
12049 12049 data list 20140503_000000 20140503_000000 20140503 20140503 1
12080 12080 data list 20140608_000000 20140608_000000 20140608 20140608 1
12082 12082 data list 20140609_000000 20140609_000000 20140609 20140609 1
12089 12089 data list 20140613_000000 20140613_000000 20140613 20140613 1
12109 12109 data list 20140709_000000 20140709_200000 20140709 20140709 17
12121 12121 data list 20140728_000000 20140728_000000 20140728 20140728 1
12135 12135 data list 20140812_000000 20140812_000000 20140812 20140812 1
12144 12144 data list 20140815_000000 20140815_000000 20140815 20140815 1
12146 12146 data list 20140822_000000 20140822_000000 20140822 20140822 1
12149 12149 data list 20140828_000000 20140828_000000 20140828 20140828 1
12152 12152 data list 20140902_000000 20140902_000000 20140902 20140902 1
12158 12158 data list 20140910_093600 20140911_053600 20140910 20140911 21
12175 12175 data list 20140926_000000 20140926_000000 20140926 20140926 1
12177 12177 data list 20141002_000000 20141002_000000 20141002 20141002 1
12186 12186 data list 20141014_000000 20141014_000000 20141014 20141014 1
12192 12192 data list 20141021_120000 20141026_230000 20141021 20141026 127
12203 12203 data list 20141103_000000 20141103_000000 20141103 20141103 1
12205 12205 data list 20141107_000000 20141110_200000 20141107 20141110 92
12209 12209 data list 20141120_000000 20141120_000000 20141120 20141120 1
12216 12216 data list 20141126_000000 20141126_000000 20141126 20141126 1
12217 12217 data list 20141129_000000 20141129_000000 20141129 20141129 1
12219 12219 data list 20141126_000000 20141126_000000 20141126 20141126 1
12221 12221 data list 20141202_000000 20141202_000000 20141202 20141202 1
12222 12222 data list 20141202_000000 20141202_000000 20141202 20141202 1
12232 12232 data list 20141214_000000 20141214_000000 20141214 20141214 1
12236 12236 data list 20141218_000000 20141218_000000 20141218 20141218 1
12242 12242 data list 20141219_123600 20141219_183600 20141219 20141219 7
12249 12249 data list 20141226_000000 20141226_000000 20141226 20141226 1
12251 12251 data list 20150101_000000 20150101_000000 20150101 20150101 1
12253 12253 data list 20150105_000000 20150105_000000 20150105 20150105 1
12257 12257 data list 20150108_000000 20150108_000000 20150108 20150108 1
12259 12259 data list 20150114_000000 20150114_000000 20150114 20150114 1
12268 12268 data list 20150127_000000 20150127_000000 20150127 20150127 1
12271 12271 data list 20150127_000000 20150127_000000 20150127 20150127 1
12275 12275 data list 20150127_000000 20150127_000000 20150127 20150127 1
12277 12277 data list 20150203_000000 20150203_000000 20150203 20150203 1
12280 12280 data list 20150207_000000 20150207_000000 20150207 20150207 1
12297 12297 data list 20150310_123600 20150313_000000 20150310 20150313 47
12303 12303 data list 20150323_000000 20150323_000000 20150323 20150323 1
12305 12305 data list 20150327_000000 20150327_000000 20150327 20150327 1
12325 12325 data list 20150420_000000 20150420_000000 20150420 20150420 1
12335 12335 data list 20150507_000000 20150507_000000 20150507 20150507 1
12360 12360 data list 20150608_000000 20150608_000000 20150608 20150608 1
12367 12367 data list 20150617_000000 20150617_000000 20150617 20150617 1
12371 12371 data list 20150622_000000 20150623_000000 20150622 20150623 25
12381 12381 data list 20150709_000000 20150709_000000 20150709 20150709 1
12396 12396 data list 20150808_000000 20150808_000000 20150808 20150808 1
12403 12403 data list 20150824_000000 20150824_000000 20150824 20150824 1
12415 12415 data list 20150917_000000 20150917_000000 20150917 20150917 1
12418 12418 data list 20150919_000000 20150919_000000 20150919 20150919 1
12420 12420 data list 20150927_000000 20150927_000000 20150927 20150927 1
12422 12422 data list 20150927_000000 20150927_230000 20150927 20150927 24
12434 12434 data list 20151019_000000 20151019_000000 20151019 20151019 1
12436 12436 data list 20151023_000000 20151023_000000 20151023 20151023 1
12443 12443 data list 20151104_000000 20151104_000000 20151104 20151104 1
12473 12473 data list 20151226_000000 20151226_000000 20151226 20151226 1
12488 12488 data list 20160125_000000 20160125_000000 20160125 20160125 1
12489 12489 data list 20160130_000000 20160130_000000 20160130 20160130 1
12494 12494 data list 20160206_000000 20160206_000000 20160206 20160206 1
12544 12544 data list 20160513_000000 20160513_230000 20160513 20160513 22
12673 12673 data list 20170904_000000 20170907_180000 20170904 20170907 390
12738 12738 data list 20190411_160000 20190411_174800 20190411 20190411 10
12781 12781 data list 20201105_000000 20201110_000000 20201105 20201110 6
12816 12816 data list 20210419_000000 20210419_234800 20210419 20210419 39
12936NRT 12936NRT data list 20220128_000000 20220130_020000 20220128 20220130 47
12975NRT 12975NRT data list 20220327_120000 20220401_010000 20220327 20220401 108

Note: The NLFFFs with the NRT suffix were extrapolated based on the SDO/SHARP near-real-time data.

Version history

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